Half-Life 2: The Apology Episode.
Join once again, we join our beloved mute scientist who goes about taking out big evil monsters and corrupt drones in this explosive finale. Once all that saving the world thing is done, you, Freeman will have to go about, in a space-age-buggy, shooting petals and gifts to the countless angry fans who have been waiting for eons for the final installment. Jump big fire ramps, share tofu with healthy eaters and enable people to enjoy themselves with the gravity gun and Dog, as you stand back and enjoy watching yourself play with the weapons of your dreams.
Also, you can get to play as Gabe Newell, ordering his studio on making a fairy game, then scraping it for L4D, experience the thrilling tension of millions of dollars and games to be made with them.